Scroll to see break-even price per barrel for oil in 2015 for select oil producers, and click on a country's name for more details. modest oil-price recovery and currency devaluations have lowered breakeven prices for countries like Russia and Nigeria, but some petrostates still need oil prices above $100 a barrel to balance their budgets.
There are dozens of types of gemstones â including diamonds, colored gemstones, and pearls â each with a unique set of physical and optical properties. GIRDLE â The narrow band around the perimeter of a polished or faceted diamond or colored gemstone.
Carat conversion charts for gemstones. Marquise cut gems, Octagon (emerald) cut chart, Oval cut chart, Pear shape gems, Round cut gems, Round diamond carat conversion chart. For more diamond information. Visit our Four C's diamond grading chart. Find more gemstone information. Visit our Gemstone index.ind Metric/English conversions in our Metric to Inch Conversion Chart. There is also a, very clear, short briefing on why physical size not carat weight is preferred in mounting gemstones or diamonds in jewelry at About Calibrated Gemstones that you should acquaint your self with.